Typescript

Basic types

Types

Types
Basic type:
Boolean, string and etc…
You can create you own type

Types

Type Assertions

Narrowing or type Guard
Fix:

Interfaces

Interfaces
Interfaces declare type of object

Interface or type ? Different
Type aliases and interfaces are very similar, and in many cases you can choose between them freely. Almost all features of an interface are available in type, the key distinction is that a type cannot be re-opened to add new properties vs an interface which is always extendable.

Optional = Properties?

Function
Function Type Expressions
Generic Functions
Function Overloads

Function Type Expressions

Function Generic